First lattice QCD calculation of semileptonic decays of charmed-strange baryonsΞc  

作　　者：Qi-An Zhang Jun Hua Fei Huang Renbo Li Yuanyuan Li Caidian Lü Peng Sun Wei Sun Wei Wang Yibo Yang 张其安;华俊;黄飞;李任博;李园园;吕才典;孙鹏;孙玮;王伟;杨一玻(Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Key Laboratory for Particle Physics and Cosmology,Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;INPAC,Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Key Laboratory for Particle Physics and Cosmology,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Nanjing Normal University,Nanjing 210023,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China;International Centre for Theoretical Physics Asia-Pacific,Beijing/Hangzhou,China)

机构地区：[1]Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Key Laboratory for Particle Physics and Cosmology,Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China [2]INPAC,Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Key Laboratory for Particle Physics and Cosmology,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [3]Nanjing Normal University,Nanjing 210023,China [4]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [5]School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China [6]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [7]School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China [8]International Centre for Theoretical Physics Asia-Pacific,Beijing/Hangzhou,China

出　　处：《Chinese Physics C》2022年第1期12-20,共9页中国物理C（英文版）

基　　金：Supported in part by Natural Science Foundation of China(11735010,U2032102,11653003,12005130,11521505,12070131001,11975127,11935017,12005130,12125503);Natural Science Foundation of Shanghai(15DZ2272100);the China Postdoctoral Science Foundation and the National Postdoctoral Program for Innovative Talents(BX20190207);National Key Research and Development Program of China(2020YFA0406400);Jiangsu Specially Appointed Professor Program;the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34030300,XDPB15);a NSFC-DFG joint grant(12061131006,SCHA 458/22);Chinese Academy of Science CAS Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100)。

摘　　要：While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four decades.Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation.As the lowest charm-strange baryons with three different flavors,Ξ;baryons(composed of csu or csd)have been extensively studied in experiments.In this study,we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings,a=(0.108,0.080 fm).Then,we present the first ab-initio lattice QCD calculation of the Ξ;→Ξ form factors.Our theoretical results for the Ξc→Ξl;v;decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations.Based on the latest experimental measurements,we independently obtain the quark-mixing matrix element |V;|,which is in good agreement with results from other theoretical approaches.

关 键 词：Ξc semileptonic decays lattice QCD form factors CKM matrix elements 

分 类 号：O572.2[理学—粒子物理与原子核物理]